90042549 has 8 divisors (see below), whose sum is σ = 120728160. Its totient is φ = 59692656.

The previous prime is 90042529. The next prime is 90042551. The reversal of 90042549 is 94524009.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90042549 - 2⁵ = 90042517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90042529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83302 + ... + 84375.

It is an arithmetic number, because the mean of its divisors is an integer number (15091020).

Almost surely, 2^90042549 is an apocalyptic number.

It is an amenable number.

90042549 is a deficient number, since it is larger than the sum of its proper divisors (30685611).

90042549 is a wasteful number, since it uses less digits than its factorization.

90042549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167859.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 90042549 is about 9489.0752447222. The cubic root of 90042549 is about 448.2110854889.

The spelling of 90042549 in words is "ninety million, forty-two thousand, five hundred forty-nine".